Numerical study of fluid and heat transfer in mixing elbow

Mohd Idham Khalid , Abu Hasan (2013) Numerical study of fluid and heat transfer in mixing elbow. Project Report. UTeM. (Submitted)

Text NUMERICAL STUDY OF FLUID FLOW AND HEAT TRANSFER IN MIXING ELBOW 24pages.pdf Download (5MB)

Abstract

Study of heat transfer and fluid flow in piping system often involves of temperature, heat flow, velocity and dynamic viscosity from the entrance the fluid enter until the fluid flow out of the pipe outlet. This study focus on the behaviour of heat transfer and fluid flow in mixing elbow. Mixing elbow is a region where two types of fluid flow with different temperature and high Reynolds number is intensively mixed together and is among typical geometries exactly where temperature fluctuation happens. Temperature fluctuation in liquid causes high cycle thermal fatigue within structure materials based on temperature distributions as well as time variations. The main objective of this study is to simulate and analyze the flow and temperature field in the mixing elbow by simulate with several models of different inlet diameters. The simulation process is done by using Computational Fluid Dynamic (CFO) software. From the simulation, it is proven that the mixed flow appeared as turbulent and caused the temperature changes which eventually generate a cyclic stress that contributes to thermal fatigue failure on the welded joint and Flow accelerated corrosion (F AC) also founds to be the contributor for thermal fatigue failure at the elbow. Besides that, it is found that from the simulation test of three models with different diameters, it would longer the service life of mixing elbow and improved it safety by increased the diameter of the inlets.

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